Step 1:Make sure Volume Shadow Copy Service is set to automatic and started. To do this, follow these steps:

a) Click on Start-Run, type services.msc, the click on OK.b) When the Services window loads, navigate to the " Volume Shadow Copy Service ", the double click on it to open it,c) Make sure the "Startup Type" says "Automatic" and started. If it doesn't, use the drop down menu to change it.d) If it already says: "Automatic", then click on the "Recovery" tab at the top, and change the "First Failure" line to "Restart the Service", then click on "apply", then OK.

Step 2:Run Check disk to fix any bad sectors on the hard drive.

a. Click on start and in the start search bar type cmd, right click on the command prompt icon in the programs area and then click on run as administrator.

b. At the command prompt type chkdsk /f and then press enter.

Now, type in chkdsk /r

Note:CHKDSK would try to recover bad sectors on the hard disk, during this process there are chances of DATA loss from that particular sector.

Step 3:Disable the security software and then start the backup; follow the steps mentioned in the link below